Improvement in manufacturing artificial stone



' 1U NITED] STATES JOSEPH WooDHULL, or MONROE GOUNTLY, NEW Y RK,-

IMPROVEMENT IN MANUFACTURING ARTIFICIAL 'STON E.

Specification forming part of Letters Patent No.- 517, dated June 15, 1837 .-antedated six months.-

.hereby declare that the following is a full and exact description thereof. 7 V

The materials of whiehthe artificial stone is manufactured and the ma'nner'of preparing them are as follows: plaster-of-paris, calcinedin the same manner as when prepared for ce-- ments lime, burned in the same way as isdone in the manufacture of quicklime, and the'n ground to a fine powder without being slaked, or otherwise slakedand thenvcalcinedyoxide of manganese and ore of iron calciued'by 1 a fullred heat, and that description of iron ore denominatedby workmen poor ore-or F. whites, calcined as above. A All of the abovenamed materials must be reduced to a find powder, and must be caleinedlalso. e

The following proportions of the above-specified materials are to be employed: five parts of plaster-of-paris to two of lime, one of manganese, oneof whites, and four of sand, all by the dry state, are ready for use.- a

Molds, when practicable, should be so coustrncted that the face side be either made or lined with glass,'-particularly when a smooth surface is sought for, or variegated marble is tobe imitated. 1

Manner of molding artificial'stoue: Mix the above-described compound with water, turn a portion into the mold, then fill into the mold broken or small stone, then turn in more of the mortar and'fill in stone, so continue until the mold is' full. It should rcmain in the mold PATENT OFFICE.

then be removed and the mold filled again.

To imitateariegated marble Mix a portion of the compound (omitting the sand). with the eolor or colors, put a'small. quantity of. water in the mold, then distribute the compound in the waterythen fill in with the drycompound until the water is taken-up',.then fill up the mold, as above described. The result in the foregoing examples will be that a highly-poh ished surface will "be obtained, which in time becomes .very hard, and which, if saturated with drying-oil, will be impervious to water and will not be injured by frost.

- Useful purposes to which the artificial stone can be applied: Stone for buildings, cornices, columns, monuments, outside finishings to buildings, cast or molded on stone'or brickand w0od,inside finishings to buildings,wa1ls,pa-r- "titious, fire-places, cornices, and o'rnaments molded. For indoor purposes the oxide ofmanganese and ore of iron may be left out in such.

cases where the colors is objected to and su periorstrength is not required. For all out *door'purposes it is necessary to saturate the surface with drying-oil. I a

' What I claim as my invention, and wish-tosecnre by Letters Patent, is-

The combining together plaster of paris, lime, the oxide of manganese, and that description of iron ore denominated whitesjand sand, all previously calcined, and the whole prepared and managed substantially in the manner herein 'set forth.

Witnesses:

B. K. MoRsELL, IsAA BE Rs.

JOSEPH WOO HULL. 

